Alternating-current electric heater



(No Model.)

G. B. FRALEY. ALTERNATING CURRENT ELECTRIC HEATER.

6VENTCR RTTORN EYS WITNESSES:

UNITED STATES PATENT OFFICE.

GEORGE B. ERALEY, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE v GLOBE ELECTRIC HEATING COMPANY, OE NEV JERSEY.

ALTERNATlNG-CU RRENT ELECTRIC H EATER.

SPECIFICATION forming part of Letters Patent No. 585,310, dated June 29, 1897.

Application filed April 27, 1897. Serial No. 634,064. (No model.)

To all whom, it may concern,.-

Be it known that I, GEORGE B. HEALEY, a citizen of the United States,residingin the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Alternating-Current Electric Heaters, which improvement is fully set forth in the following specilication and accompanying drawings.

My invention consists of an improved construction of electric heater which is especially adapted to be used with an alternating current, the heater being cheaply and effectively manufactured and readily assembled and disconnected accordingto requirements.

It further consists of novel details of construction, all as will be hereinafter set forth, and fully pointed out in the claims.

Figure l represents a side elevation of an electricheaterembodyingmyinvention. Fig. 2 represents a longitudinal sectional view of Fig. l. Eig. 3 represents a plan View of the heater, showing the manner of assembling and insulating the parts. Fig. 4- represents a section on line y y, Fig. 2.

Similar letters of reference indicate corresponding parts in the figures.

Referring to the drawings, A designates a heater, the same being composed of the shell B, which latter is preferably a sheet of copper or other suitable conductive material which is wrapped upon itself in substantially the manner indicated in Fig. 3, forming a core, said core having between its convolutions the insulation E, which may be asbestos or other suitable material, it being noted that the free ends or edges C D of said sheet terminate, preferably, substantially opposite to each other and that the intermediate portion of the shell has an opening E therein, through which passes a fastening Q2, which also serves as an electrical conductor between the inner and outer portions of the shells, there being a fastening device at top and bottom.

G designates the lower portion of the heater, the same being devoid of insulation and having the extremity of the wire or conductor J in contact therewith and with the clip, clamp, or bracket II tosupport the lower portion of the heater, said clamp having the extension L, on which the nut L is mounted, said eX- tension L serving also as a support for the conductor Q', which is insulated therefrom by means of the insulation R and is held in position between the shoulder R2 and said nut.

K designates asbestos or other non-conducting material which incases the shell B, eX- tending from a point above the clamp H to the top of said shell, the clamp P being thus insulated from contact with the shell and the wire or conductor J being wound on said nonconducting material, forming a primary coil J and having its upper portion M communieating with said clamp P, the current being thus taken from the extremity M of the conductor to the clamp P and thence through the conductor Q to the terminal Q,which is adapted to serve as a binding-post.

R designates a series of reiiectors which are placed within the shell B and are secured therein in any suitable manner, as by the fastening device T.

If desired, the reflectors may be located exteriorly of the ends of the heater, as indicated at S in dotted lines in Fig. 2.

The operation is as follows: The current entering at the point L passes into the clamp H and thence, by means of the primary coil J', around the insulation K and into the clamp P at the upper portion of the heater, it being remembered that said clamp is insulated from the shell B by means of the non-conductor K, the current passing from the clamp P through the portion Q to the terminal Q and thence out of the heater. The passage of the current through the primary coil J in the manner described causes an induced or secondary current to be set up through the shell or core B, which latter has its ends connected electrically, as indicated at Q2, and by reason of the low resistance causes a large amperage of current to flow around itself. This amperage is produced by the primary or heating coil J, which performs two functions--iirst, acting as a heating-coil in itself, and, secondly, inducing a secondary current which in its turn produces additional heat. o

By increasing the convolutons of the core we get more voltage in the secondary circuit, which latter acts as a support for the primary coil, it being evident that the voltage and amperage of the induced current is in proportion IOO to the number of ampere-turns in the primary coil and also to the convolutions of said core.

It will thus be seen from the foregoing that an effective heater is thus produced, due to the number of parts being reduced to aminimum, and the construction greatly simplified.

llavin thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In an electric heater, the combination of a tubular core Vformed of a convoluted sheet of conducting material having its ends electrically connected and constituting' a closed-circuit secondary coil, insulation between the convolutions of the sheet, a primary coil surrounding and in inductive relation to the seeondary coil and insulated therefrom, and means for putting,` the primary coil in circuit with a source of alternating current.

2. In an electric heater, a sheet of conductive material wrapped upon itself and havin g insulation therebetween, forming a core, a primary coil inclosing a portion of said core, and insulated therefrom, a clamp orsupportin g device engaging the lower portion of said core, a connection 'from said clamp to said primary coil, a device engaging' the upper portion of said core and insulated therefrom, a connection from said last-mentioned device to said primary coil, and means for conveying electricity to and from said clamgs.

In an electric heater, a sheet of suitable conducting material wrapped upon itself forming` a core and electrically connected at the ends thereof, insulation between the convolutions of said core, a primary coil surrounding` the latter and insulated therefrom, a support engaging' the lower portion of said cere and haying` a connection to said primary coil, a support for the upper portion of said core but insulated therefrom, said support having also a connection to said primary coil, a connection Q extending` from the upper su pport and sustained upon a portion of the lower support but insulated therefrom and means for conveying,` electricity to and from said supports.

GEORGE ll. FPALEY.

Witnesses z J oHN A. WInDEnsnEin, E. li. FAn-nmNKs, 

